Subclass Ophiuridea Gray 1840 (brittle star)
Full reference: J. E. Gray. 1840. A synopsis of the genera and species of the class Hypostoma Asterias (Linn.). Annals and Magazine of Natural History 6:275-290
Parent taxon: Ophiuroidea according to J. W. M. Jagt 2000
Sister taxa: Ataxaster, Calclyra, Calclyridae, Calyptactis, Cheiropterasteridae, Encrinasteridae, Eophiuridae, Euryalida, Euzonosomatidae, Hallasteridae, Klasmuridae, Lumectaster, Myophiuroida, Oegophiurida, Oegophiuridea, Oegophiuroida, Ophiaulaxoides, Ophioflabellum, Ophioma, Ophiotrigonum, Ophiurella, Ophiurida, Phrynophiurida, Stenasteridae, Stenurida
Subtaxa: none
Ecology: slow-moving low-level epifaunal detritivore-suspension feeder